EP0090871B1 - Détecteur à haute pression - Google Patents

Détecteur à haute pression Download PDF

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Publication number
EP0090871B1
EP0090871B1 EP82102929A EP82102929A EP0090871B1 EP 0090871 B1 EP0090871 B1 EP 0090871B1 EP 82102929 A EP82102929 A EP 82102929A EP 82102929 A EP82102929 A EP 82102929A EP 0090871 B1 EP0090871 B1 EP 0090871B1
Authority
EP
European Patent Office
Prior art keywords
sealing
sensor part
sensor
high pressure
pressure transducer
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP82102929A
Other languages
German (de)
English (en)
Other versions
EP0090871A1 (fr
Inventor
Paul Engeler
Peter Wolfer
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kistler Instrumente AG
Original Assignee
Kistler Instrumente AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Kistler Instrumente AG filed Critical Kistler Instrumente AG
Priority to AT82102929T priority Critical patent/ATE24764T1/de
Priority to DE8282102929T priority patent/DE3275009D1/de
Priority to EP82102929A priority patent/EP0090871B1/fr
Priority to US06/481,881 priority patent/US4559821A/en
Publication of EP0090871A1 publication Critical patent/EP0090871A1/fr
Application granted granted Critical
Publication of EP0090871B1 publication Critical patent/EP0090871B1/fr
Expired legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
    • G01L5/14—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for measuring the force of explosions; for measuring the energy of projectiles
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L23/00—Devices or apparatus for measuring or indicating or recording rapid changes, such as oscillations, in the pressure of steam, gas, or liquid; Indicators for determining work or energy of steam, internal-combustion, or other fluid-pressure engines from the condition of the working fluid
    • G01L23/08—Devices or apparatus for measuring or indicating or recording rapid changes, such as oscillations, in the pressure of steam, gas, or liquid; Indicators for determining work or energy of steam, internal-combustion, or other fluid-pressure engines from the condition of the working fluid operated electrically
    • G01L23/10—Devices or apparatus for measuring or indicating or recording rapid changes, such as oscillations, in the pressure of steam, gas, or liquid; Indicators for determining work or energy of steam, internal-combustion, or other fluid-pressure engines from the condition of the working fluid operated electrically by pressure-sensitive members of the piezoelectric type
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L9/00—Measuring steady of quasi-steady pressure of fluid or fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means
    • G01L9/0041—Transmitting or indicating the displacement of flexible diaphragms
    • G01L9/008—Transmitting or indicating the displacement of flexible diaphragms using piezoelectric devices

Definitions

  • the invention relates to a high-pressure transducer for fastening in a mounting hole of a component, with a sensor part with a membrane section acting on a sensor element with the pressure to be measured and with a frontal sealing surface which can be brought into sealing engagement with a counter surface of the mounting hole.
  • pressures up to 10 9 Pa is a special area that is of great importance especially in ballistics. Pressures of up to 2 x 10 8 Pa also occur during injection processes on diesel engines. In newer pulse cutting processes, hydraulic pressure peaks up to 4 x 10 8 Pa are used.
  • the invention is particularly, but not exclusively, aimed at sensors for detecting such high pressures.
  • a preferred application is therefore the ballistic pressure measurement in the development of guns and ammunition in order to determine the pressure curve during the firing of a projectile.
  • piezome technology is particularly advantageous for dynamic high-pressure measurements, since the extraordinarily high resolution of these transducers allows the pressure curve to be monitored very precisely, from ignition with pressures of a few Pascals to combustion with pressures of up to 10 9 Pa.
  • the piezo effect as a volume effect in piezo crystals allows measurement that is practically deformation-free.
  • the membrane parts of such piezo pickups are therefore subject to only minimal deformation, which enables a long service life.
  • the tightening torques to create an effective seal are comparatively high and can in particular be values up to 60 Nm, which can result in corresponding deformations of the sealing surfaces and other sensitive sensor parts with an effect on the measuring sensitivity. Due to the high tightening torques required, no transducers are currently available whose sensitivity is practically unaffected by the assembly process.
  • a transducer for normal loads in which measures are provided to avoid a direct effect of the lines of force flow emanating from the clamping elements on the housing of the transducer.
  • These comprise a holding sleeve which surrounds the housing and is pressed against a shoulder surface of the sensor housing by a hollow screw which can be screwed into a mounting hole in order to fasten the sensor in the mounting hole.
  • the clamping members are arranged at a substantial distance from the membrane section, and the sealing surface is set back substantially in the direction of the base body with respect to the front of the transducer.
  • Fig. 1 shows a typical known piezoelectric high pressure transducer with front seal.
  • the influencing of the sensitivity of the transducer by the assembly process stems from the fact that the force flow lines introduced into the transducer by the sealing forces penetrate the sensitive sensor part as well as the parting plane at which the sensor part rests and is attached to the base body. This results in split spring effects in the area of the parting plane and deformations of the sensor part, which in turn affect the membrane part of the sensor which acts on the sensor elements with the measuring pressure.
  • the invention has for its object to provide a high pressure transducer of the type mentioned, which is essentially insensitive to different clamping conditions.
  • the solution to this problem in a device of the type mentioned is characterized by a flange part projecting from the sensor part in the area of the membrane part as a carrier of the front sealing surface, which is connected to a banjo screw that can be screwed into the mounting hole for fastening the transducer.
  • the flange part is preferably welded to the hollow screw and the flange part is connected to the sensor part via an elastic cross-sectional constriction.
  • the flange part is at the same time carrier of the sensor part and means for sealing of the transducer opposite the mounting hole.
  • the flange part can be designed with the banjo bolt with a minimal thickness in order to keep warping of the sensor part due to upsetting of the clamping elements to a minimum.
  • Another preferred development of the invention provides that the hollow screw surrounds the sensor part at a distance, so that any deformations of the hollow screw also have no effect on the sensor part.
  • the flange part can also have a recess near its front sealing surface for receiving a self-sealing deformable sealing ring, as described in detail in DE-C-1 775 646.
  • a high-pressure transducer with a blind hole seal is created, which is particularly suitable for the measurement of fast-moving printing processes with high peak values and has both a high level of responsiveness and a long service life, since the sensor part and in particular the sensitive diaphragm area of the transducer are sealed despite the frontal forces Sealing is practically not loaded.
  • the sensitivity of the transducer is not influenced by the level of the tightening torque when the transducer is screwed into the mounting hole, nor by elastic boundary conditions or aging effects. This ensures that both the measurement accuracy and the reproducibility of the measurement remain unchanged regardless of the respective installation conditions.
  • top and bottom used in the following description refer to the positional relationship of the parts shown in the drawing.
  • Fig. 1 shows a known high pressure transducer with a blind hole seal. This type of seal is easier to manufacture, but has the disadvantage that the membrane section 7 cannot be installed flush with the surface of the pressure chamber, so that a supply bore 30 is always necessary. Due to the required high accuracy of the drilling, surface lapping and tapping work to be carried out, the relevant tools are supplied by the transducer manufacturer.
  • the known transducer comprises a base body 1 with an external thread 2 for screwing into a mounting hole 11 such that the free lower end face 3 of a sensor part 4 attached to the base body comes into sealing engagement with a shoulder surface of the mounting hole 11.
  • a sensor element 5 is arranged in a recess in the sensor part 4, which is preferably one or more suitable piezo crystals, the electrical charges of which are discharged to the outside via a signal line 6 guided through the base body 1.
  • the free lower end face of the sensor is partially formed by the internally thickened membrane section 7, which transmits the pressure signal generated by the medium pressure p as a force to the sensor element 5 and is preferably made in one piece with the sensor part 4.
  • the sensor part 4 itself is welded to the base body 1 with its upper bearing surface 8 facing the base body 1, as indicated at 9.
  • the medium pressure p acts on the membrane section 7 up to the sealing surface 3.
  • the compression force transformation takes place in an extremely complex structure.
  • the necessary contact pressure of the sealing surface 3 against the sales surface of the mounting hole is provided when the base body is screwed into the bore section T. Sealing torques of 30 ... 60 Nm are necessary for this.
  • force flow lines K arise, as indicated, which also extend to the sensitive sensor part.
  • the medium pressure p forces a change in the static force flow lines K, which again has an effect on the sensor sensitivity.
  • the thermal component of a gas surge which results in additional tensioning of the membrane section 7, has a further significant influence on the membrane section 7, which can result in dynamic errors in the measurement.
  • the sensor part 4 Due to the construction, the sensor part 4 is penetrated by the force flow lines K and torsional forces over the entire height. Correspondingly, there are considerable adverse influences on the tensioning of the sensor element 5 and the membrane section 7. An additional problem is the upper large separating or supporting surface 8, which, depending on the design of the weld 9, leads to more or less gap suspension, which should be avoided as far as possible .
  • Fig. 2 shows a high pressure sensor according to the invention.
  • the pickup according to the before Preferred embodiment of the invention in turn comprises a base body 1, which, however, is here preferably integrally connected to the sensor part 4.
  • the sensor part 4 has at its lower end a membrane section 7 which is exposed to the media pressure p and which acts on a sensor element 5 accommodated in the sensor part of the type described in connection with FIG. 1.
  • a signal line 6 passing through the base body 1 leads the charges arising at the sensor element 5 to the outside.
  • the base body 1, as shown, is surrounded on the outside by a hollow screw 21, which can be screwed with its external thread 2 relatively far into the mounting hole 11 of the component to be examined.
  • the mounting screw On its lower end surface 23, the mounting screw is firmly connected to the upper side of a flange-like flange part 22 which projects horizontally outwards from the sensor part 4 via a weld seam 24.
  • the sealing surface 3 is provided on the underside of the flange part 22.
  • indentations 25 and 26 can be introduced at suitable points between flange part 22 and sensor part 4, which create a weakened connection of the flange part 22 to the sensor part 4 and thereby prevent the lines of force flow from the flange part 22 into the sensor part 4.
  • the extent to which the flange part 22 is weakened by the indentations 25 and 26 or to what extent the connection between sensor part 4 and flange part 22 can be reduced in thickness t depends on the pressure p to be measured, which is to be sealed, and also of the other operating conditions. Tests have shown that the thickness t of the connecting web between the flange part 22 and the sensor part 4 should preferably not be greater than about 25% of the front diameter of the sensor.
  • a further advantage from the provision of a hollow screw 21 is that the overall height of the flange part 22 and its connection to the sensor part 4 can be very small, as a result of which the force flow lines run only a short distance in the vicinity of the sensor part 4 and accordingly only can have a slight effect on the sensor part 4 or its membrane section 7.
  • the hollow screw 21 only touches the base body 1 at an upper area, while in the area of the sensor part 4 there is a distance between it and the hollow screw, so that any deformations of the hollow screw do not affect the Can affect sensor part 4.
  • a groove for receiving a locking ring 29 can be introduced in the upper region of the base body 1, which further fixes the hollow mounting screw 21.
  • the membrane section 7 or the sensor part 4 is set back somewhat upwards relative to the sealing surface 3, as a result of which the pressure medium can be distributed over the entire membrane section 7 and the latter over one the precisely defined area is subjected to the measuring pressure.
  • Fig. 3 shows a partial view of a modified high-pressure transducer according to the invention with a blind hole seal.
  • a metal sealing ring 27 engages when installing the transducer, which is described in detail in DE-PS 17 75 646.
  • the metal sealing ring 27 is a pipe section 28, cf. Fig. 3 below, which assumes the configuration shown in Fig. 3 by elastic deformation during installation and results in a perfect seal even with very small tightening torques.
  • FIG. 3 shows in more detail the formation of the elastic connection of the flange part 22 to the sensor part 4 by means of the recesses 25 and 26.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Measuring Fluid Pressure (AREA)

Claims (6)

1. Détecteur à haute pression destiné à être fixé dans un orifice alésé de montage (11) d'une pièce mécanique, comportant une partie de détection (4) comprenant une partie membrane (7) sollicitée par la pression à mesurer et agissant sur un élément détecteur (5) et une surface d'obturation frontale (3) pouvant être disposée sur une contre- surface de l'orifice alésé de montage (11) de manière à assurer l'étanchéité de l'ensemble, caractérisé en ce qu'il est prévu, dans la zone de la partie membrane (7), de manière à former la surface d'obturation frontale (3) à la périphérie de la partie de détection (4), une collerette (22) reliée à un boulon creux (21) destiné à être vissé dans l'orifice ablésé de montage (11) en vue de réaliser la fixation du détecteur, de sorte que les lignes fonctionnelles de force générées par le couple de serrage sont substantiellement maintenues à l'écart de la partie de détection, lors du montage étanche du détecteur.
2. Détecteur à haute pression suivant la revendication 1, caractérisé en ce que la collerette (22) est soudée au boulon creux (21).
3. Détecteur à haute pression suivant la revendication 1 ou 2, caractérisé en ce que la collerette (22) est reliée à la partie de détection (4) suivant une réduction de section.
4. Détecteur à haute pression suivant la revendication 3, caractérisé en ce que la réduction de section ou étranglement possède une épaisseur (t) correspondant à environ 25% maximum du diamètre frontal du détecteur.
5. Détecteur à haute pression suivant une des revendications qui précèdent, caractérisé en ce que le boulon creux (21) entoure la partie de détection (4) à une certaine distance de celle-ci.
6. Détecteur à haute pression suivant une des revendications qui précèdent, caractérisé en ce que la collerette (22) présente, à proximité de la surface d'obturation frontale (3), un évidement destiné à recevoir une bague (27, 28) se déformant au moment du montage du détecteur, de manière à assurer l'étanchéité de l'ensemble.
EP82102929A 1982-04-06 1982-04-06 Détecteur à haute pression Expired EP0090871B1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
AT82102929T ATE24764T1 (de) 1982-04-06 1982-04-06 Hochdruckaufnehmer.
DE8282102929T DE3275009D1 (en) 1982-04-06 1982-04-06 High-pressure detector
EP82102929A EP0090871B1 (fr) 1982-04-06 1982-04-06 Détecteur à haute pression
US06/481,881 US4559821A (en) 1982-04-06 1983-04-04 High pressure transducer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP82102929A EP0090871B1 (fr) 1982-04-06 1982-04-06 Détecteur à haute pression

Publications (2)

Publication Number Publication Date
EP0090871A1 EP0090871A1 (fr) 1983-10-12
EP0090871B1 true EP0090871B1 (fr) 1987-01-07

Family

ID=8188972

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82102929A Expired EP0090871B1 (fr) 1982-04-06 1982-04-06 Détecteur à haute pression

Country Status (4)

Country Link
US (1) US4559821A (fr)
EP (1) EP0090871B1 (fr)
AT (1) ATE24764T1 (fr)
DE (1) DE3275009D1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3811311C1 (fr) * 1988-04-02 1989-03-09 Robert Bosch Gmbh, 7000 Stuttgart, De
DE102005011973A1 (de) * 2005-03-13 2006-09-14 Endress + Hauser Gmbh + Co. Kg Sensormodul
US8015880B2 (en) 2006-11-20 2011-09-13 Toyota Jidosha Kabushiki Kaisha Pressure sensor

Families Citing this family (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0230491B1 (fr) * 1986-01-22 1989-05-03 Kristal Instrumente AG Capteur, en particulier pour des mesures de haute pression
DE8903667U1 (de) * 1989-03-23 1989-05-11 Kistler Instrumente Ag, Winterthur Hochdruckaufnehmer
AT394112B (de) * 1989-03-30 1992-02-10 Avl Verbrennungskraft Messtech Druckaufnehmer
US4969352A (en) * 1989-08-21 1990-11-13 General Motors Corporation Combustion pressure sensor
DE4230031A1 (de) * 1991-09-09 1993-03-11 Avl Verbrennungskraft Messtech Drucksensor
US5367904A (en) * 1993-03-19 1994-11-29 General Motors Corporation Non-intrusive cylinder pressure sensor having improved response characteristics
FR2703772B1 (fr) * 1993-04-10 1995-05-19 Bosch Gmbh Robert Douille de pression, notamment pour un capteur de cognement.
CH691625A5 (de) * 1997-09-15 2001-08-31 Kk Holding Ag Beschleunigungskompensierter Druckkaufnehmer.
DE10318679A1 (de) * 2003-04-24 2004-12-30 Vega Grieshaber Kg Befestigungsanordnung für einen Sensor an einem Behältnis
US6923068B2 (en) * 2003-06-19 2005-08-02 Dynisco, Inc. Pressure transducer
US7197918B2 (en) * 2003-08-14 2007-04-03 International Engine Intellectual Property Company, Llc Apparatus and method for evaluating fuel injectors
WO2008011092A2 (fr) * 2006-07-20 2008-01-24 Askew Andy R Transducteur de hautes pressions
JP5195451B2 (ja) * 2008-04-15 2013-05-08 株式会社デンソー 燃料噴射装置、それに用いられる蓄圧式燃料噴射装置システム
AT506705B1 (de) 2008-09-11 2009-11-15 Piezocryst Advanced Sensorics Piezoelektrischer drucksensor
AT513321A1 (de) 2012-08-16 2014-03-15 Bosch Gmbh Robert Gewindeverbindung zum Verbinden von Hochdruckmedium führenden Komponenten
US20160153443A1 (en) * 2013-10-30 2016-06-02 Lime Instruments, Llc Sensor assembly for measuring dynamic pressure in reciprocating pumps
JP6404776B2 (ja) * 2015-06-09 2018-10-17 株式会社Ｓｏｋｅｎ 燃焼圧センサ
US9689534B2 (en) * 2015-11-11 2017-06-27 Chad Deville Pipeline-waste-gas reduction method
US9695988B2 (en) * 2015-11-11 2017-07-04 Chad Deville Pipeline-waste-gas reducer apparatus
US10444060B2 (en) 2016-05-13 2019-10-15 Adaptec Medical Devices LLC Fluid container measurement system
ES2764437T3 (es) 2016-05-13 2020-06-03 Adaptec Medical Devices LLC Sistema de medición de recipientes de líquido y método de medición de un recipiente de líquido
CN108151639B (zh) * 2017-12-18 2023-09-01 中船重工西安东仪科工集团有限公司 一种耐压密封装配体内部零件位移精密测量装置

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH582353A5 (fr) * 1974-11-08 1976-11-30 Kistler Instrumente Ag

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2629801A (en) * 1950-08-01 1953-02-24 Howard D Warshaw Mounting for pressure responsive device
US3247719A (en) * 1963-10-01 1966-04-26 Chelner Herbert Strain decoupled transducer
US3225859A (en) * 1964-03-30 1965-12-28 Lawrence C Davidson Pipe line hydrophone system
US3335381A (en) * 1965-07-06 1967-08-08 Stratham Instr Inc Duplex flexure for force transducer
US3587322A (en) * 1969-06-17 1971-06-28 Simmonds Precision Products Pressure transducer mounting

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH582353A5 (fr) * 1974-11-08 1976-11-30 Kistler Instrumente Ag

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3811311C1 (fr) * 1988-04-02 1989-03-09 Robert Bosch Gmbh, 7000 Stuttgart, De
DE102005011973A1 (de) * 2005-03-13 2006-09-14 Endress + Hauser Gmbh + Co. Kg Sensormodul
DE102005011973B4 (de) * 2005-03-13 2012-04-19 Endress + Hauser Gmbh + Co. Kg Sensormodul
US8015880B2 (en) 2006-11-20 2011-09-13 Toyota Jidosha Kabushiki Kaisha Pressure sensor
DE112007002814B4 (de) * 2006-11-20 2013-10-10 Toyota Jidosha Kabushiki Kaisha Drucksensor
DE112007002814B8 (de) * 2006-11-20 2013-12-19 Toyota Jidosha Kabushiki Kaisha Drucksensor

Also Published As

Publication number Publication date
US4559821A (en) 1985-12-24
DE3275009D1 (en) 1987-02-12
ATE24764T1 (de) 1987-01-15
EP0090871A1 (fr) 1983-10-12

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